Would look into the magazine size for the chassis model. The mag that came with mine for an A5 stock had a spacer up front, so it's likely their own model comes with mags for SAAMI spec cartridges. Keep in mind these were built for the military in mind, so they're designed around those dimensions.
Price wise you can't beat them, much cheaper than the competitors.
I have the newer PGWDTI 10 round mags and a couple older 8 round mags for my chassis Coyote. There are no spacers in the fronts of the magazines. I currently seat 139 gr. Lapua Scenars at 2.850" for my .260 Rem loads and have a wee bit of room left.
A number of PGW "military" actions have been used to win a number of F class matches in Canada. Back at the last Westerns in Chilliwack, BOTH FTR and Open were won by PGW actioned rifles. The FTR rifle was a prize that PGW gave a few years back.. nothing changed so right off the table.
They work very well,
Jerry
Is yours the A5 or the chassis?
I'm fairly certain the guys at Insite or the Chou brothers could put together a custom that would outperform a Coyote.